Move WildFly Preview to a native Jakarta namespace variant of the jpa subsystem module

WildFly Preview should use a native jakarta variant of the WildFly jpa subsystem and the weld/jpa integration module. As we still want to support EE 8 for now this should be done by creating a source-transformation module under https://github.com/wildfly/wildfly/tree/main/ee-9/source-transform.

https://lists.jboss.org/archives/list/wildfly-dev@lists.jboss.org/thread/LF7CZSONQQEX2DYCJOV4QGSKGCURMGKT/

Artifacts being transformed by the WildFly Galleon plugin are:

[INFO] EE9: transformed wildfly-jpa-26.0.0.Beta1-SNAPSHOT.jar
[INFO] EE9: transformed wildfly-weld-jpa-26.0.0.Beta1-SNAPSHOT.jar